The San Francisco Police Department confirmed to NFL.com that Crabtree has been questioned about the sexual assault.

Crabtree allegedly sexually assaulted a woman at a hotel after the 49ers' 45-31 victory over the Green Bay Packers on Jan. 13, per the report.

According to the NFL.com report, the victim did not immediately contact the police after the alleged assault, instead coming forward a few days later. Officer Gordon Shyy told NFL.com that Crabtree was interviewed earlier this week, the investigation is still active and Crabtree is being cooperative.

Crabtree traveled with the 49ers to Atlanta on Friday for Sunday's NFC Championship Game.

Michael Crabtree has avoided charges following an investigation by the San Francisco Police Department. According to CSNBayArea.com, San Francisco District Attorney George Gascon released the following statement:

The San Francisco Police Department - Special Victims Unit completed and submitted a thorough investigation of the allegations against Michael Crabtree. Following a review of all the evidence, my office has determined that no charges will be filed against Michael Crabtree at this time.

---End of update---

UPDATE: Sunday, Jan. 20, at 1:52 p.m. ET by Brandon Galvin

Michael Crabtree is active for the 49ers' NFC Championship game against the Falcons, according to San Francisco Chronicle's Eric Branch.

As expected, Michael Crabtree is active and will start in today’s NFC Championship Game two days after the 49ers wide receiver met with San Francisco Police Department detectives in connection to an alleged sexual assault.

Crabtree, who has not been arrested or detained since the alleged assault occurred in the early morning of Jan. 13, traveled with the rest of the team to Atlanta on Friday afternoon.

Crabtree will be one of five active wide receivers today. The 49ers will also dress Randy Moss, Ted Ginn, A.J. Jenkins and Chad Hall, who was promoted from the practice squad Saturday.

According to a CSNBayArea.com report, Crabtree's lawyer Joshua M. Bentley has released a statement maintaining that his client is confident he will not be convicted of any charges.

Here's Bentley's statement:

On Friday, January 18, 2013, Michael Crabtree voluntarily met with the San Francisco Police Department and provided a statement. Michael fully cooperated with the inspectors and will continue to do so throughout the investigation. We have confidence in the process. Out of respect and integrity for the process, we have no further comment at this time.

There still has been no arrest or detainment in the case, and Crabtree is expected to play Sunday against the Atlanta Falcons in the NFC Championship game.

---End of update---

UPDATE: Saturday, Jan. 19, at 11:23 a.m. ET by Patrick Clarke

The San Francisco 49ers reportedly don't expect the current situation involving Michael Crabtree to impact his availability for Sunday's NFC Championship Game in Atlanta, according to NFL Network reporter Albert Breer (via Twitter):

Was told the Niners absolutely don't expect the Crabtree case to effect his availability for tomorrow. But they are monitoring it, of course

We are aware of the allegation against Michael and understand that he has fully cooperated with authorities. The 49ers take such matters very seriously. We will have no further comment at this time as the legal process is ongoing. Additional requests for comment should be directed to Michael’s attorney.

The 25-year-old has had a career year after a tumultuous start to his tenure in San Francisco, one which saw Crabtree hold out for a better contract to begin his rookie season in 2009.

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Crabtree caught a team-high 85 balls for 1,105 yards and nine touchdowns for San Francisco during the regular season, and he's been particularly hot in his past two games, racking up 172 yards and two touchdowns in the regular-season finale against the Arizona Cardinals and 119 yards and two scores against the Packers in the divisional round of the playoffs.

Crabtree has been the go-to receiver for the 49ers all season long while tight end Vernon Davis has had a disappointing campaign by his standards. Mario Manningham was second to Crabtree among wide receivers with 449 receiving yards.

The Texas Tech product has developed a nice rapport with second-year quarterback Colin Kaepernick. He also posted seven catches for 107 yards and two touchdowns in the 41-34 victory over the New England Patriots in Week 15.

As of now, Crabtree isn't expected to miss the NFC Championship Game against the Atlanta Falcons on Sunday.